Yahoo!

Have apparently decided I'm not allow to use my phone's app or windows mail on my computer to access my email for 'security reason'

Chrome doesn't like letting me unto the webmail interface for it for the exact same reason.

eta: switched off their new security stuff. how long they'll let me get away with that is another matter. I should have been able to use 'app passwords' to let the apps in but I could not get them to work for the life of me.